Married woman wearing her ring on and off

There is this married woman at my workplace that I think is in the process of filing for divorce from her soon to be ex-husband...or maybe she has already finalize the divorce....The reason why I know is because she told me about 2 months ago that she was going to file for divorce.

Anyway, the weird thing is that last Monday through Friday, she did not wear her ring....However, today she wore her ring again....Well, this is not the first time....She did the same thing last month. Is this some type of religious thing for a woman to wear her ring on and off? She is Catholic and her husband is Muslim.